Primary standards is of high purity, less impurity, good stability, chemical composition constant. Capacity analysis, the reference reagent in determination of pH in determination of calorific value, and so on. Have the first reference and classification standard of each classification. Where the first reference must be made by the National Institute of metrology verification. The production units used as the first reference standard benchmark products. At present, reference reagent business mainly refers to the capacity analysis in capacity analysis of benchmark [content range 99.95%~100.05% (gravimetric titration). Generally used to calibrate the titrant.
MSDS, international known as chemical safety information card, is the physical and chemical properties of the chemical manufacturers and distributors must provide according to the legal requirements of the chemicals (such as pH, flash, flammable, toxic, reactive etc.), environmental hazards, and health of users (such as carcinogenic, teratogenic) may produce a comprehensive document. It includes the harm of hazardous chemicals Flammable, explosive properties, toxicity and environmental hazards, and safety, emergency handling, the main physical and chemical parameters, the comprehensive laws and regulations on the information.
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